# OpenAI's GPT-5.6 Trio, Sol, Terra, and Luna, Arrive on Bedrock!

Hi everyone, it's Shii-chan! Amazon Bedrock just welcomed a new family of models, and this time it's a trio!

## What was announced?

This comes from AWS What's New. OpenAI's GPT-5.6 family, made up of Sol, Terra, and Luna, is now generally available on Amazon Bedrock, accessible through the Responses API on Bedrock's next-generation inference engine.

## Why it matters

GPT-5.6 aims to solve harder problems in less time with more intelligence per token. What stands out here is that instead of one model, three capability tiers arrived together: Sol for flagship reasoning, Terra for balanced performance, and Luna for fast, low-cost inference. You can now pick the tier that fits what you're building.

## What changes

- **Sol** — The flagship reasoning model. Good for building autonomous coding agents, running long-horizon genomics and biology analyses, and advanced cybersecurity research. It delivers state-of-the-art results on agentic coding benchmarks
- **Terra** — Gives you GPT-5.5-level performance at half the cost
- **Luna** — The most affordable tier, built for fast, cost-efficient inference

You can now choose among these three depending on your use case and budget.

## Dive Deep

GPT-5.6 supports prompt caching with explicit cache breakpoints, so repeated context in agentic workflows is billed at a 90% discount. That means costs don't compound as much the longer an agent runs. Pricing matches OpenAI's first-party rates, and usage counts toward your AWS commitments.

Regional availability differs by model:

- **Sol** — US East (N. Virginia), US East (Ohio)
- **Terra and Luna** — US East (N. Virginia), US East (Ohio), US West (Oregon)

You can get started through the Amazon Bedrock Console or the Responses API.

## Wrap-up

- Sol, Terra, and Luna (GPT-5.6 family) are now GA on Amazon Bedrock
- Sol is flagship reasoning, Terra is balanced, Luna is fast and low-cost
- Terra matches GPT-5.5-level performance at half the cost
- Cache breakpoints give a 90% discount on repeated context
- Sol covers 2 regions; Terra and Luna cover 3

If you want to run agentic coding or long-running tasks on Bedrock, or you want to pick the right model tier for the job, this one's for you.